I tried the following two scenes in MegaPOV, and expected to get a unit
sphere in both of them, needless to say this did not happpen.  The first
rendered the expected sphere, the second didn't.  Is this a bug or am I just
not seeing a stupid mistake?  Any help would be appreciated--Quadhall.

*****************
scene 1
#version unofficial MegaPOV 0.4;
light_source { <0,0,-8> 1}
camera { location <0,0,-5> look_at <0,0,0> }
isosurface
{
 function {sqrt(sqr(x)+sqr(y)+sqr(z))}
 contained_by{sphere {0,4}}
 threshold 1
 pigment{color rgb <1,1,1>}
}
***********************
scene 2
version unofficial MegaPOV 0.4;
light_source { <0,0,-8> 1}
camera { location <0,0,-5> look_at <0,0,0> }
isosurface
{
 function {(sqr(x)+sqr(y)+sqr(z))}
 contained_by{sphere {0,4}}
 threshold 1
 pigment{color rgb <1,1,1>}
}

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